Add time:09/30/2019         Source:infona.pl

Herein two conjugated donor molecules, TDPP‐POCN and FDPP‐POCN, with planar diketopyrrolopyrrole (DPP) as the core building‐block acceptor unit and phenoxazine‐capped acrylonitriles as arms are designed and synthesized. Solution‐processed bulk‐heterojunction organic solar cells based on blends of the small‐molecule donors and [6,6]‐phenyl‐C71‐butyric acid methyl ester (PC71BM) exhibit promising photovoltaic device performance with a maximum power conversion efficiency up to 4.8 % for TDPP‐POCN and 3.4 % for FDPP‐POCN under the illumination of AM1.5G, 100 mW cm–2. To the best of our knowledge, this is the highest efficiency reported so far in DPP–phenoxazine‐based systems and among acrylonitrile‐bridged donor‐π‐acceptor‐π‐donor‐structured small‐molecule donors for solution‐processed small‐molecule‐based organic solar cells.

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